ARM: mach-omap2: omap5/dra7: Enable ACTLR[0] (Enable invalidates of BTB) to facilitate CVE_2017-5715 WA in OS
Enable CVE_2017_5715 and since we have our own v7_arch_cp15_set_acr
function to setup the bits, we are able to override the settings.
Without this enabled, Linux kernel reports:
CPU0: Spectre v2: firmware did not set auxiliary control register IBE bit, system vulnerable
With this enabled, Linux kernel reports:
CPU0: Spectre v2: using ICIALLU workaround
NOTE: This by itself does not enable the workaround for CPU1 (on
OMAP5 and DRA72/AM572 SoCs) and may require additional kernel patches.
Signed-off-by: Nishanth Menon <nm@ti.com>
diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
index 3bb1ecb..77820cc 100644
--- a/arch/arm/mach-omap2/Kconfig
+++ b/arch/arm/mach-omap2/Kconfig
@@ -53,6 +53,7 @@
bool "OMAP54XX SoC"
select ARM_ERRATA_798870
select SYS_THUMB_BUILD
+ select ARM_CORTEX_A15_CVE_2017_5715
imply NAND_OMAP_ELM
imply NAND_OMAP_GPMC
imply SPL_DISPLAY_PRINT